Since the URHO3D_PCH build option is made available to support non-PCH build, our build system does not rely on precompiled header to include the Urho3D.h export header anymore. The export header is auto-included by one of Urho3D headers when it is required using the right format with the help of URHO3D_IS_BUILDING compiler define. As such, there is no need to explicitly include Urho3D.h in external project too. Sorry for the flip-flop.
It is now a library user own's responsibility to include the Urho3D.h in their source code. Or to include it as part of their own precompiled header similar to what Urho3D project has done.
The C Header file is intended to be 'force included' in the IDE to get content assist / code completion when editing AngelScript file in the C/C++ editor. The output section of DumpAPI() method is reordered slightly to keep the parser happy. This work is inspired by the work done by Vladimir Andri (see https://groups.google.com/forum/#!topic/urho3d/8WOOGAdwlEU).
Added note in documentation about lack of space between command line option and its parameter.
Prepend Materials/ to the material list written by OgreImporter (assume "standard" materials subdirectory.)
